Grille of a truck vehicle



FIG. 1 is a front and right side perspective view of a grille of a truck vehicle showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof; and,

FIG. 4 is a top plan view thereof. 

The ornamental design for a grille of a truck vehicle, as shown and described. 